I have worked with Mark for over 2 years. I first started working with him to gain better technique. I had done the Total Immersion workshop and while it improved my stroke, I still didn't feel very efficient or fast. Mark broke down my stroke systematically. He showed me, through videotape and pictures of my stroke, where my stroke was less than efficient (to put it nicely!). He then went over drills to correct these. I think Mark's greatest asset is his ability to watch your stroke and figure out exactly what you need to change to improve.

He personally helped me to swim faster at Ironman Wisconsin than I ever thought I could.